高级系统分析师相同项单选集试卷（三）.doc

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试卷第 PAGE 1 页共 NUMPAGES 1 页

高级系统分析师相同项单选集试卷

姓名:_____________ 年级:____________ 学号:______________

题型

选择题

填空题

解答题

判断题

计算题

附加题

总分

得分

评卷人

得分 1、 One of the difficulties in building an SQL-like query language for the Web is the absence of a database(131)for this huge, heterogeneous repository of information. However, if we are interested in HTML documents only, we can construct a virtual schema from the implicit structure of these files. Thus, at the highest level of(132), every such document is identified by its Uniform Resource Locator (URL), and a(133)and a text. Also, Web severs provide some additional information such as the type, length, and the last modification date of a document. So for data mining purposes, we can consider the set of all HTML documents as a relation: Document (url, rifle,

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